The case of Caitlin, used in the text, demonstrated that the psychologist's intervention for trichotillomania was effective when applied in an ABAB reversal design. In this case, what signaled the success of the intervention?

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The success of the intervention was signalled by the decrease in targeted behaviour during the B phase, which was the phase where the intervention was applied. This decrease in behaviour suggests that the intervention was effective in reducing trichotillomania. The subsequent increase in behaviour during the second A phase (after the intervention was removed) further supports the effectiveness of the intervention.

The Case of Caitlin, Used in the Text, Demonstrated That